Flook is an Anglo-Irish band playing traditional-style instrumental music, much of it penned by the band themselves. Their music is typified by extremely fast, sometimes percussive, flute and whistle atop complex guitar and bodhrán rhythms. Flook is made up of Brian Finnegan, Sarah Allen, Ed Boyd and John Joe Kelly.

Flook's 10th anniversary tour included a concert at the Purcell Room (on 7 November 2005) as part of a week of "Folk in the Fall" on London's South Bank and another at the new Sage Gateshead concert hall on the south bank of the River Tyne on 10 November 2005. Their third studio album, Haven, was released in October 2005.

In December 2008 the band sent a Christmas message saying they were disbanding. "We wanted to wish you a very Happy Christmas and also to share some news with you," said a band press release. "After 13-plus years, hundreds of gigs, millions of miles traveled together and countless brilliant times, we've decided to call it a day. It might be forever or a prolonged pause, who knows, but we're all still great friends and will always remain so. This might sound like a cliché but it is deeply truthful."

The group reformed (briefly) for an appearance on the BBC Northern Ireland programme, Blas Ceoil.

Flook are now back together in 2013 and are currently touring.

On Friday 12 January 2018, the group posted a photo of themselves, with the caption "It’s a new year and we’re in Bath (United Kingdom) rehearsing new tunes", reported by Lynette Fay on BBC Radio Ulster's Folk Club on 14 January 2018, who described the band as "iconic, ground-breaking, progressive and all-round brilliant".[1]